Answer:
Multiply the number in kilograms by 1000 to get grams.
So 73 kilograms * 1000 = 73000 grams.
<omg xp>
And if your mass is 73 kg what is the mass of your brain in grams ?
Awnser:
Brain mass doesnt depend on body weight. The average weight of a human brain is 1400 grams.
It doesnt matter if you weigh 50 kg or 250 kg, your brains will still weigh near 1.4 kilograms.